<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>三角巧妙运用</title>

    <style>
        .box1 {
            width: 0;
            height: 0;
            /* border-top: 100px solid transparent;
            border-right: 50px solid pink;
            border-bottom: 0 solid transparent;
            border-left: 0 solid transparent; */
            border-color: transparent pink transparent transparent;
            border-style: solid;
            border-width: 100px 50px 0 0;
        }

        .price {
            width: 160px;
            height: 24px;
            border: 1px solid red;
            margin: 0 auto;
            line-height: 24px;
        }

        .miaosha {
            position: relative;
            float: left;
            width: 90px;
            height: 100%;
            background-color: red;
            text-align: center;
            color: #fff;
            font-weight: 700;
            margin-right: 8px;
        }

        .miaosha i {
            position: absolute;
            right: 0;
            top: 0;
            width: 0;
            height: 0;
            border-color: transparent #fff transparent transparent;
            border-style: solid;
            border-width: 24px 10px 0 0;
        }

        .origin {
            font-size: 12px;
            color: gray;
            text-decoration: line-through;
        }
    </style>

</head>
<body>
    
    <div class="box1"></div>
    <div class="price">
        <span class="miaosha">
            ￥1659
            <i></i>
        </span>
        <span class="origin">￥5650</span>
    </div>

</body>
</html>